X-Git-Url: https://erislabs.net/gitweb/?a=blobdiff_plain;f=m4%2Fmodf.m4;h=20163f7e8c475c86cc9817c413393fd6b4b0de57;hb=da8054d48dc22e1c051db54049e005d51a006e69;hp=43a66967583b014259b1fa9b6f99352228d670e1;hpb=b5cc9885b4b5a247870adf0ed9b9f4a5a3347a26;p=gnulib.git

diff --git a/m4/modf.m4 b/m4/modf.m4
index 43a669675..20163f7e8 100644
--- a/m4/modf.m4
+++ b/m4/modf.m4
@@ -1,5 +1,5 @@
-# modf.m4 serial 2
-dnl Copyright (C) 2011-2012 Free Software Foundation, Inc.
+# modf.m4 serial 3
+dnl Copyright (C) 2011-2013 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
 dnl with or without modifications, as long as this notice is preserved.
@@ -14,6 +14,7 @@ AC_DEFUN([gl_FUNC_MODF],
 
   m4_ifdef([gl_FUNC_MODF_IEEE], [
     if test $gl_modf_required = ieee && test $REPLACE_MODF = 0; then
+      AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
       AC_CACHE_CHECK([whether modf works according to ISO C 99 with IEC 60559],
         [gl_cv_func_modf_ieee],
         [
@@ -59,7 +60,13 @@ int main (int argc, char *argv[])
             ]])],
             [gl_cv_func_modf_ieee=yes],
             [gl_cv_func_modf_ieee=no],
-            [gl_cv_func_modf_ieee="guessing no"])
+            [case "$host_os" in
+                       # Guess yes on glibc systems.
+               *-gnu*) gl_cv_func_modf_ieee="guessing yes" ;;
+                       # If we don't know, assume the worst.
+               *)      gl_cv_func_modf_ieee="guessing no" ;;
+             esac
+            ])
           LIBS="$save_LIBS"
         ])
       case "$gl_cv_func_modf_ieee" in